abb_3bdh000014r1_sd812f_power_supply
Description:
The ABB 3BDH000014R1, also designated as SD812F, is a high-efficiency 24 V DC Switch-Mode Power Supply Module manufactured by ABB for use in ABB Freelance 800F and System 800xA / AC 800F DCS racks. It converts a wide-range AC input (100–240 V AC) into a tightly regulated 24 V DC output at up to 10 A (240 W), with support for N+1 parallel redundant operation via an external OR-ing diode module, making it the standard DC power source for controller CPUs, I/O modules, and communication interfaces in process automation cabinets.
Application Scenarios:
In a continuous ethylene cracker plant, the local Freelance 800F DCS rack houses a PM783F CPU, several S700 I/O modules, and a Profibus DP coupler—all powered from a single ABB 3BDH000014R1 SD812F. After 12 years of service, the original PSU began showing a dim “DC OK” LED and occasional undervoltage warnings during summer peak loading. To eliminate the risk of an unplanned DCS blackout during a critical run, the maintenance team upgraded to a redundant pair of SD812F modules with an external diode-OR module. One unit now carries the full load while the second stands hot-standby; if either is removed for service or fails, the other seamlessly maintains the 24 V DC bus with zero interruption to the control system. The front-panel LEDs give operators immediate visual confirmation of supply health during daily rounds, and the wide-input design accommodated the site’s 208 V AC / 230 V AC swing without adjustment—directly solving the pain point of single-source DC power in a validated process environment.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3BDH000014R1 (Type: SD812F) |
| Manufacturer | ABB (ABB Automation / Process Automation Division) |
| Product Category | DCS Rack-Mount Switch-Mode Power Supply Module |
| System Compatibility | ABB Freelance 800F, AC 800F / System 800xA (non-high-performance variant rack) |
| Input Voltage | 100 – 240 V AC (auto-ranging), 50/60 Hz (some versions accept 120–250 V DC) |
| Output Voltage | 24 V DC ±1% (adjustable typical range 22.5 – 28.5 V DC via trim pot) |
| Rated Output Current | 10 A continuous @ 24 V DC |
| Rated Output Power | 240 W (24 V × 10 A) |
| Efficiency | ≥ 93% at full load (typical) |
| Redundancy Support | N+1 parallel operation with external OR-ing diode module (not included) |
| Hold-Up Time | ≥ 20 ms @ full load (bridges brief AC interruptions) |
| Protection Features | Short-circuit, overload (hiccup mode auto-recover), over-temperature, overvoltage cutoff |
| Status Indication | Power ON (green), Output OK / Fault (green/red dual LED) |
| Mounting Method | Dedicated PSU slot in ABB Freelance / AC 800F DCS rack (guide-rail + locking latch) |
| Operating Temperature | –25 °C to +70 °C (derating above +60 °C typical) |
| Dimensions (approx.) | 128 × 60 × 135 mm (H × W × D), Weight ≈ 0.95–1.20 kg |
| Certifications | CE, UL 508, cULus, IEC 61131-2, IP20 (cabinet install only) |
Technical Principles and Innovative Values:
- Innovation Point 1: Universal Auto-Ranging AC Input with Active PFC. The ABB 3BDH000014R1 accepts worldwide mains voltages (100–240 V AC) without a selector switch and features Active Power Factor Correction, reducing harmonic distortion on the plant’s AC distribution—a key advantage over older linear transformer supplies in densely populated MCC sections.
- Innovation Point 2: N+1 Redundant Operation with Seamless Failover. Designed for process-critical DCS applications, the SD812F can be paralleled with a second unit through an external diode-OR module. Load is shared dynamically; removal or failure of one module causes no voltage dip on the 24 V DC bus, protecting the control system from power-related trips during maintenance or fault conditions.
- Innovation Point 3: Low-Ripple Regulated Output & Built-In Diagnostics. Output ripple is typically < 50 mV p-p, ensuring clean power for sensitive analog measurement circuits in the S700 / S800 I/O. The dual-color LED indicates both normal operation and fault modes (overload, overtemperature, input loss), allowing technicians to identify a failing PSU before it causes a system shutdown—turning a silent failure into a preemptive alarm.
